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I don't understand your question. Merlin is a human that is 3k+ years old. Her mind is old af so she definitely isn't a child in a grown body. She did stop the aging of her body but that doesn't mean she didn't grow mentally. She didn't stay with the mind of an 8 year old (or however old she was). She can change her body to look whatever age she wants with magic and she doesn't age naturally because she stopped her time with magic.
And Android 21 was made using an adult woman as a template. She therefore had an adult brain. Even if she was 10 years old she was in no way a child who needed her parents to take care of her. She wasn't human. She was an artificial life (which is different from 18 and 17 who are modified humans).
It says on the Wiki for The Seven Deadly Sins that she is 3000+ chronologically and 30 appearance wise. If she is not an adult and is actually a child then I don't want to read the series anymore. :[
I want to confirm otherwise so that doesn't happen. Honestly, this isn't funny at all. First Android 21 from Dragon Ball FighterZ and now Merlin. What is the damn truth!
What are their proper ages!?